Blood Donation Interval Calculator | When You Can Next Give 400 mL or 200 mL Whole Blood, Plasma or Platelets, With the Yearly Limits (Japanese Red Cross Criteria)
The Blood Donation Interval Calculator answers questions such as “when can I donate again after giving 400 mL?”, “how many weeks after a plasma or platelet donation?” and “how many more times can I donate this year?”. Enter your sex and the date and type of your last donation, and it applies the donation intervals in the Japanese Red Cross criteria: 4 weeks after 200 mL; after 400 mL, 12 weeks (men) or 16 weeks (women) for whole blood and 8 weeks for component donations; 2 weeks after a plasma or platelet donation; and 1 week from a platelet-only donation to the next platelet donation. It shows the next possible date and weekday for 400 mL and 200 mL whole blood, plasma and platelets, and how many days are left. If you add earlier donations, it also moves the date later when a 52-week limit would be exceeded: whole-blood donations (6 for men, 4 for women), 400 mL donations (3 for men, 2 for women), whole-blood volume (1,200 mL for men, 800 mL for women) and component donations (24, counting each platelet donation as 2). Includes an eligibility check by age and weight, an .ics file to add the dates to your calendar, an interval chart, the age, weight and haemoglobin criteria for each type, and the plasma volume by body weight.
Calculate your next donation date from your last donation
Enter the date and type of your last donation to see when you can next give 400 mL or 200 mL whole blood, plasma and platelets.
Sex
Last donation date
Type of last donation
Earlier donations (last 52 weeks, to include the yearly limits)
Add the records from your donor card or the Love Blood app to check the yearly count and volume limits as well.
Also enter age and weight to rule out types you cannot give (optional)
Enter the date of your last donation.
Results are a guide based on the Japanese Red Cross donation criteria. You may be unable to donate because of the interview, blood pressure or haemoglobin test on the day, or conditions such as medication, overseas travel, dental treatment or piercings. The doctor at the donation centre makes the final decision.
ABOUT
About Blood Donation Interval Calculator | When You Can Next Give 400 mL or 200 mL Whole Blood, Plasma or Platelets, With the Yearly Limits (Japanese Red Cross Criteria)
The Blood Donation Interval Calculator is a free tool that works out the next date you can give each type of donation (400 mL or 200 mL whole blood, plasma or platelets) from the date and type of your last donation, using the donation intervals and the 52-week count and volume limits in the Japanese Red Cross donation criteria.
How to use Blood Donation Interval Calculator | When You Can Next Give 400 mL or 200 mL Whole Blood, Plasma or Platelets, With the Yearly Limits (Japanese Red Cross Criteria)
- 1Choose your sex (the interval after a 400 mL donation and the yearly limits differ for men and women)
- 2Enter the date and type of your last donation (400 mL, 200 mL, plasma or platelets)
- 3To include the yearly limits, add your earlier donations from the last 52 weeks with “Add a donation”
- 4Check the next possible date and weekday for 400 mL, 200 mL, plasma and platelets, and how many days are left
- 5Optionally enter your age and weight to rule out types you cannot give, and save the dates to your calendar as an .ics file
Great for
- Finding out when you can give whole blood again after a 400 mL donation
- Checking how many weeks after a plasma or platelet donation you can go back
- Making sure you can donate on a given day before booking at a donation centre
- Seeing how many more whole-blood donations, and how many mL, you can give in the last 52 weeks
- Checking which types you can give for a first donation, from your age and weight
- Looking up the interval chart by previous and next donation type
Good to know
- Intervals are counted from the day of donation. After 200 mL whole blood, every type is possible after 4 weeks; after 400 mL, whole blood after 12 weeks for men and 16 weeks for women and component donations after 8 weeks; after a plasma or platelet donation, every type after 2 weeks. Because intervals are whole weeks, the next date falls on the same weekday. For example, a man who gave 400 mL on Sunday 1 November 2026 can give whole blood from Sunday 24 January 2027 (a woman from Sunday 21 February), and both can give components from Sunday 27 December 2026.
- After a platelet donation without plasma, another platelet donation is possible after 1 week. After 4 such donations within 4 weeks, wait at least 4 weeks before the next.
- In any 52 weeks you can give whole blood up to 6 times (men) or 4 times (women), of which 400 mL up to 3 or 2 times, with a total whole-blood volume of up to 1,200 mL (men) or 800 mL (women); component donations are limited to 24, counting each platelet donation as 2. The limits use the 52 weeks (364 days) up to the donation day, not the calendar year.
- Age limits: 200 mL 16-69; 400 mL 17-69 for men and 18-69 for women; plasma 18-69; platelets 18-69 for men and 18-54 for women. People aged 65-69 must have donated between 60 and 64. Weight: at least 50 kg for 400 mL, otherwise 45 kg for men and 40 kg for women.
- The tool shows the earliest date that satisfies the intervals from every donation you enter and the 52-week limits. You may still be unable to donate because of the interview, blood pressure (systolic at least 90 mmHg), the haemoglobin test, medication, overseas travel, dental treatment and so on; the doctor at the donation centre makes the final decision.
Questions this tool answers
Use Blood Donation Interval Calculator | When You Can Next Give 400 mL or 200 mL Whole Blood, Plasma or Platelets, With the Yearly Limits (Japanese Red Cross Criteria) for searches like these:
- Find the next date I can donate blood after my last donation
- Check the interval after a 400 mL donation (12 weeks for men, 16 for women)
- Know the interval for plasma and platelet donations
- Know how many times and how much blood I can give in a year
- Find which donation types I can give at my age and weight
- See a chart of blood donation intervals
FAQ
- When can I donate again after giving 400 mL?
- Whole blood (400 mL or 200 mL) from the same weekday 12 weeks later for men and 16 weeks later for women; plasma and platelet donations from 8 weeks later for both. After a 400 mL donation on 1 November 2026, men can give whole blood from 24 January 2027, women from 21 February 2027, and both can give components from 27 December 2026.
- How many weeks should I wait after a component donation?
- After a plasma or platelet donation, both whole-blood and component donations are possible from the same weekday 2 weeks later. After a platelet donation without plasma, another platelet donation is possible after 1 week (after 4 in 4 weeks, wait at least 4 weeks).
- What about after a 200 mL donation?
- After 200 mL whole blood, 400 mL and 200 mL whole blood and plasma and platelet donations are all possible from the same weekday 4 weeks later, for both men and women.
- How many times a year can I donate?
- In the last 52 weeks, whole blood up to 6 times for men and 4 times for women (400 mL up to 3 and 2 times), with a total whole-blood volume of up to 1,200 mL for men and 800 mL for women. Component donations are limited to 24, counting each platelet donation as 2 and adding plasma donations. For example, if a woman gives 400 mL on 4 January and 3 May 2026, her next whole-blood donation is possible from 3 January 2027, 52 weeks after the first.
- What are the age and weight requirements?
- 200 mL: 16-69; 400 mL: from 17 (men) or 18 (women) to 69; component donations: 18-69 (platelets for women up to 54). People aged 65 or over must have donated between 60 and 64. Weight: at least 50 kg for 400 mL, and 45 kg for men or 40 kg for women for 200 mL and component donations.
- Can I definitely donate on the calculated date?
- No. The tool shows the earliest possible date based on the intervals and yearly limits. You may not be able to donate because of the interview, blood pressure, the haemoglobin test, medication, a recent return from abroad, dental treatment and other conditions.
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